Lathing



H. E. MARKS..

LATHING.

APPLICMIQN FILED JAN. 5,1922.

Patented Nov. 21, 1922,

INVENTOR Patented Nov. 21, 1922.

STATES HERBERT E. MA RKS,

OF GLEN OSBORNE, PENSYLVANIA.

LATHING.

Application filed January 5, 1922. Serial No. 527,203.

T 0 all 'w ham it may co'ncem Be it known that I, HERBERT E. MARKS. acitizen of the United States, residing at (tlen Osborne, in the countyof Alleglieny and State of Pennsylvania, have invented a new and usefulImprovement in Lathing. of.wl1ich the following is a full, clear, andexact description.

My invention relates to lathing, and more particularly to lathing madeof 'plaster' board. Plaster-board is a well known article of manufactureand is used in Sheets for making walls, ceilings, etc. The plasterboardusually consists of an inner layer about one-fourth of an inch thick ofgypsum plaster faced on both sides with heavy paper. I have found thatthe plaster-board if cut into strips of about the width of ordinary woodlaths forms an unusually good lathing material. Thile the .plaster-boardsheets may be cut into laths, a cheaper source of the material is thewaste from the plasterboard mills, which can' be cut up into narrowlathing strips.

In the drawings which illustrate the preferrcd embodiment of theinvention,--v

Figure l is an elevation of a strip of my lathing material in which thelaths are carried on a paper hacking;

Figure 2 is a longitudinalsection through the lathing, taken at rightangles to the laths themselves;

Figure 3 is a similar cross section showing a modification;

Figure 4 is another cross section showing still another modification;and

Figure 5 is a fragmentary perspective view showing the lath and itsattachment to the paper hacking in greater detall.

Referring to the illustrated embodiment of the invention, the laths 1themselves consist of long narrow strips of plaster-board having aboutthe same length, width and thickness as the usual wood laths. Each lathconsists of an inner layer or body 2 of gypsum plaster and has its twofaces formed by the paper layers 3 and 4. The laths are formedpreferably by breaking off the strips so that the edges 5 of'the plasterlayer are rough and form anpunusually good bond with the plastering tobe applied. The laths may be used alone, but I prefer to make up alathing'ready for use by applying the laths 1 to a paper hacking 6.l Thepaper 6 is a heavy strong paper having about the same weight and Waterabsorptive qualities as the paper 3 and 4 of the plaster-board. Thelaths 1 are` applied to the paper preferably by some adhesive material,such as glue. prefer to use a water-proof glue, or other water-proofmaterial, such as asphaltum. The material can, with a water-proofcement, be exposed to moisture without the lathing strips becomingdetached. If' desired, the lathing may be applied to the paper bymechanical fastening means, such as staples 7, as shown in Figure 4, orthe staples may be employed in conjunction with The lathing strips arespaced apart on the paper hacking preferably so that the space betweenthe laths is not materially less than the width of the laths. Thispermits fewer laths to be used than when the usual wooden laths areapplied. The paper backing keeps the plaster from being pushed throughbetween the laths, permitting the laths to be spaced farther apart andat the same time saving the waste. plaster which falls down behind thelaths when no hacking is employed. In the construction shown in Figure2, the laths are spaced apart by about double the width of theindividual laths. Such a construction may be used for side walls. Whenthe laths are to Joe used for ceilings, they are preferably spacedcloser together, as shown, for example` in Figures 3 and 4. The lathsmay have straight sides. as shown in Fi'gure 2, or one side may beundercut or beveled. as shown in Figure 3. or both sides may bebeveled,as shown in Figure 4, to .increase the lock of the plaster with thelaths. If further locking of the plaster is desired, holes, indicated at8, may be cut through the paper, preferably along the sides of thelaths 1. through which the plaster may protrude and form a lock.

The lathing is preferably made up as above described, by applying theplasterboard laths to a paper hacking. The material is preferably madein long rolls so that pieces may be cut off the heightv of the room wallor width of the ceiling'and readily applied. The paper hacking holds thelath in correct spaced' relation so that the cut offv strip of lathingmaterial may be hung on the side wall from the top and then quicklynailed into place. The fastening nails are driven directly through theplaster-board lath into the studding. The paper forming the hacking 6 isused preferably with its lengthwise grain at right angles to the laths.whereby' its greatest strength is available the adhesive.

lengthwise of the roll where it is most needed. The` laths arepreferably, but not necessarily, cut so that the lengthwise or strongestdirection of the paper layers 3 and 4 is lengthwise of the lath strips.

The plaster-board laths are strong and permit the lathing to be used'with widely spaced studding. The paper backing keeps the plaster fromlfalling back between the laths and being wasted. The rough exposededges of the interior plaster layer of the plaster-board form .a strongbond with the plaster., V

The plaster-board closely 'resembles, in its physical qualities, theplaster which is applied. It has about the same degree of contractionand expa'nsion, moisture-absorbing qualities, etc., so that the wallcontaining the plaster and plaster-board forms a much more homogeneousSheet of material than is the case where other types of lathing areused. If the plaster becomes wet, there isv much less likelihood 'of itscracking than where materials are employed which have absorptivequalities difl'ering from those of the plaster' The lath and the paperbacking have the correct **suction. This term is employed by theplasterers to define the adhesion of the plaster to the lath as it is'initi'ally applied' The degree of so called 'suction is ap-` parentlydependent on the porosity or waterabsorbing qualities of the lathingmaterial. If the material absorbs water too readily, it has too great ortoo quick suction, so that while the plaster bonds to it almostimmediately, the lwater is drawn out too quickly and the plasterdioesnot properly set. On the other hand, if the material has littleabsorbentqualities, it is said to have no suction, and it is difiicult to applythe plaster. The plaster-board lath 'has about the right suction so thatthe plaster can be readily applied by the Workman. The combination ofthe gypsum plaster core and the paper facing on the lath, together withthe paper backing, give the propersuction and ready adhesion of theplaster to the lathing 'materia-l. j

By the use of my lathingmaterial,y one coat may be eliminated from the'usual present practice required by many city ordinances for buildingconstruction.v In applying plaster, particularly on wooden laths, arough coat is applied and this is allowed to set. The water goes intothe wooden laths and the laths apparently expand'. This'first roughcourse of plaster cracks into a great many small cracks. After thecracking, period is over, a so-called scratch coating is applied, andthen a third or finishing coat applied over the scratch coat. In usingmy plaster-board lathing, the cracking of `the first coat is prevented,so "that the rough and scratch coats may be combined into a single coat,with a time.

By the term plaster-board as used in the specification and claims ismeant-the well known article of manufacture` of that `name or itslequivalent, that is to say, sheet material 'the body' of which iscomposed of plaster or plastic material having physical(lualitiessimilar to plaster as regards suct1on.

The present invention is not limited to the illustrated em'bodment, butmay be otherwise embodied within the scope of the following claims. v

I claim: A

1. A- narrow lath consisting of a core of plaster with its edges exposedand with paper facings on both sides, substantially .as described.

2. A lath consisting of a core of plaster with paper facings on bothsides, the exposed edges of the plaster core being rough to afford agood bonding surface, substantially as described.

3. A narrow lath cut vfrom plaster-board great saving of labor, cost andand having the edges of the body thereof exsheet, substantially asdescribed.

5. A lathing material comprising a sheet of paper having cementedth'ereto strips or 100 laths of plaster-board, such. strips being'formed of a plaster core and having paper faces, one of which iscemented to the paper sheet, thel exposed edges of the plaster corebeing rough to afl'ord a good bonding surface, substantially asdescribed.

' 6. A lathing material comprisingV a sheet of paper having cementedtheretostrips or laths of plaster-board, such strips being formed of aplaster core and'having paper faces, one of which is cemented'to thepaper sheet, the paper' having perforations therein through which theplaster may form looks, 'substantially as described.

7. A lathing material comprising a Sheet of paper having secured theretostrips or laths of' plaster-board, such strips being formed of a plastercore and having paper faces, one of which lies against the paper Sheet,substantially as described.

8. A lathing material comprising a sheet of paper having secured.thereto strips or laths of plaster-board, such strips being formed of aplaster core and having paper faces, vthe exposed edges of the plastercore being rough to aford a good' bonding surface, substantially asdescribed.

9. A lathing material comprising a Sheet of paper having applied theretonarrow strips or laths of plaster-board, such strips I;

;nad-m8 vbeing formod of a plaster body and, having st least one paperce, substantallyas de- 10.' A narrow lath consistingof a body of 5plaster with its edges-exposed 'and with a.

aper facing on .at least one side, substm- -tia'lly as desorbed.

ll. .A narrow lath Acomprising a body of plastic material having exposededges to adyhere to an applied coating of plaster and af 10'reen'forcing facing on at least one side of ,HERBERT E. MARKS.

